Fast electrochemical doping due to front instability in organic semiconductors

TL;DR

This paper investigates a doping front instability in organic semiconductors that accelerates electrochemical doping, leading to improved device performance through enhanced doping rates and device kinetics.

Contribution

It introduces a new physical mechanism of doping front instability, develops a theoretical model, and demonstrates how device design can leverage this to speed up doping processes.

Findings

Doping front instability significantly increases doping rate.

Experimental and numerical evidence supports the instability mechanism.

Optimized device design amplifies the instability for faster doping.

Abstract

The electrochemical doping transformation in organic semiconductor devices is studied in application to light-emitting cells. It is shown that the device performance can be significantly improved by utilizing new fundamental properties of the doping process. We obtain an instability, which distorts the doping fronts and increases the doping rate considerably. We explain the physical mechanism of the instability, develop theory, provide experimental evidence, and perform numerical simulations. We further show how improved device design can amplify the instability thus leading to a much faster doping process and device kinetics.